This will get the matrix built, later we will discuss what’s needed to get it running.

Step 2: The LEDsTo build an 8x8 LED matrix, we’re going to be using a total of 64 5mm Red LEDs, it never hurts to have some extra though.

Make sure you note which side is the cathode(-) and the anode(+). Basically, the longer side is the positive side and the other one is the negative.

Now, we will begin arranging our bulbs on our perf board. If you're not familiar with a perf board, this is how it looks like.

Step 3: Arranging the LEDs

Because we’ve opted to use the common-row cathode arrangement in our matrix, we will be inserting the pins of the LEDs into the perf board in a particular fashion. It is extremely important to be diligent in this process.

As you can see, we’ve opted to keep the long side (anode) on top, because we will be bending them vertically.

Now the fun begins….

Step 4: Soldering the Matrix

By using soldering iron and lead, we can now start putting the LEDs together.

Now, we will start soldering the anode columns. It’s absolutely critical that the anodes DO NOT touch the cathodes. Here, we’re using a screwdriver to assist with the bending process.

Now, let’s check our work. Connect ground to your rows, and power to your columns… make sure you use a resistor!

This is what it’ll look like when your soldering is complete.

Step 5: Attaching the connectors

Now that our LEDs are arranged and we’ve tested each of the circuits, we will go ahead and attach the 8 pin headers to the perf board.

Then we’ll add some solder to keep the headers secure.

Then, the resistors.

Now comes the (arguably) most difficult part of this build with regards to soldering skill…. connecting the pins to the rows and columns.Keep in mind that the pins will be reversed when you flip the board over, so pay close attention to your work.

Now we’ll test our connections one by one.

Then, we move on to the anode side.

Now we can power up the unit!

That's it!

Last edited by Admin on Mon Sep 18, 2017 9:17 am; edited 1 time in total